[openib-general] Re: TSO and IPoIB performance degradation

[Michael S. Tsirkin]

Quoting r. Michael S. Tsirkin <mst at mellanox.co.il>:
> Or does __tcp_ack_snd_check delay until we have at least two full sized
> segments?

What I'm trying to say, since RFC 2525, 2.13 talks about
"every second full-sized segment", so following the code from
__tcp_ack_snd_check, why does it do

	    /* More than one full frame received... */
	if (((tp->rcv_nxt - tp->rcv_wup) > inet_csk(sk)->icsk_ack.rcv_mss

rather than

	    /* At least two full frames received... */
	if (((tp->rcv_nxt - tp->rcv_wup) >= 2 * inet_csk(sk)->icsk_ack.rcv_mss

-- 
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies